U.S. patent application number 09/833544 was filed with the patent office on 2002-10-17 for center scribing kit for use with drilling templates.
Invention is credited to Welch, Robert.
Application Number | 20020148120 09/833544 |
Document ID | / |
Family ID | 25264707 |
Filed Date | 2002-10-17 |
United States Patent
Application |
20020148120 |
Kind Code |
A1 |
Welch, Robert |
October 17, 2002 |
Center scribing kit for use with drilling templates
Abstract
A center marking assemblage or kit consisting of a stylus
retaining quill having an upper end and a lower end; a stylus
having an upper driving end and a lower scribing end, the stylus
being slidably mounted within the stylus retaining quill, a group
of differently sized scribing end centering guides, each guide
among the group having a lower circular diameter matching a common
drill bit size; and consisting of quick disconnect couplings
integral with the lower end of the stylus retaining quill and with
the upper ends of the scribing end centering guides, such couplings
allowing such guides to be selectively and alternately attached to
and removed from the lower end of the stylus retaining quill.
Inventors: |
Welch, Robert; (Harper,
KS) |
Correspondence
Address: |
Kenneth H. Jack
Davis & Jack, L.L.C.
2121 W. Maple
Wichita
KS
67213
US
|
Family ID: |
25264707 |
Appl. No.: |
09/833544 |
Filed: |
April 11, 2001 |
Current U.S.
Class: |
30/367 ; 30/358;
30/368 |
Current CPC
Class: |
B25D 5/00 20130101; B23B
47/287 20130101 |
Class at
Publication: |
30/367 ; 30/368;
30/358 |
International
Class: |
B26B 027/00 |
Claims
I claim:
1. A center marking assemblage comprising: (a) a stylus retaining
quill having an upper end and a lower end; (b) a stylus having an
upper driving end and a lower scribing end, the stylus being
slidably mounted within the stylus retaining quill; (c) a plurality
of differently sized scribing end centering guides; and, (d)
interchangeable attaching means, adapting the scribing end
centering guides for alternate selective attachments to the lower
end of the stylus retaining quill.
2. The center marking assemblage of claim 1, wherein each stylus
centering guide comprises a second quill having a cylindrical lower
end, the cylindrical lower end having a diameter, said diameter
being unique with respect to the diameters of the lower ends of the
other second quills.
3. The center marking assemblage of claim 2, wherein the stylus
retaining quill comprises an inner wall, and wherein the stylus
comprises an outer wall, said inner and outer walls comprising a
plurality of slide stops.
4. The center marking assemblage of claim 3 further comprising
spring biasing means normally upwardly positioning the upper
driving end of the stylus for downward percussive or pressurized
contact.
5. The center marking assemblage of claim 3, wherein the
interchangeable attaching means comprises a fastener selected from
the group of floating ball locking slip joints, spring biased ball
and detent locking slip joints, spring leaf and detent locking slip
joints, ridge and channel locking slip joints, hook and channel
locking slip joints, hook and ridge locking slip joints, lug and
"L" slot locking slip joints, lug and "L" channel locking slip
joints, frictionally attached slip joints, free sliding slip
joints, and spirally threaded joints.
6. The center marking assemblage of claim 2, wherein the diameter
of the cylindrical lower end of each second quill is closely fitted
to a dimension selected from the group of alphabetically lettered
drill bit sizes.
7. The center marking assemblage of claim 2, wherein the diameter
of the cylindrical lower end of each second quill is closely fitted
to a dimension selected from the group of numbered drill bit
sizes.
8. The center marking assemblage of claim 2, wherein the diameter
of the cylindrical lower end of each second quill is closely fitted
to a dimension selected from the group of English drill bit
sizes.
9. The center marking assemblage of claim 2, wherein the diameter
of the cylindrical lower end of each second quill is closely fitted
to a dimension selected from the group of metric drill bit
sizes.
10. The center marking assemblage of claim 6, wherein each
alphabetically lettered drill bit size is selected from the group
of sizes A through Z.
11. The center marking assemblage of claim 7 wherein each numbered
drill bit size is selected from the group of sizes 1 through
25.
12. The center marking assemblage of claim 8 wherein each English
drill bit size is selected from the group of sizes {fraction
(3/16)}", 1/4", {fraction (5/16)}", 3/8", {fraction (7/16)}", 1/2",
{fraction (9/16)}", 5/8", {fraction (11/16)}", 3/4", {fraction
(13/16)}", 7/8", {fraction (15/16)}", and 1".
13. The center marking assemblage of claim 9 wherein each metric
drill bit size is selected from the group of sizes 5 mm through 25
mm.
Description
FIELD OF THE INVENTION
[0001] The instant invention relates to template guided drilling.
More particularly, the invention relates to apparatus adapted for
assisting of machinists in utilizing drilling templates.
BACKGROUND OF THE INVENTION
[0002] Drilling templates are commonly serve dual functions of
drill site location and tactile/visual assistance in drill bit
selection. Where, for example, a drilling template prescribes a
square four inch on center pattern of diagonally paired 3/8" and
1/2" holes, such template will commonly comprise a flat aluminum
sheet having holes positioned and sized identically with the holes
to be drilled. Such an aluminum sheet template efficiently
facilitates tactile/visual selection of the 1/2" and a 3/8" drill
bits needed for drilling. In selecting the drill bits, the operator
of the template simply slides a candidate drill bit through one of
the template holes to assure that the bit is of the proper gauge.
If such bit will not slide through the hole in the template, the
bit is immediately identified as too large. Conversely, if the
candidate bit fails to closely fill the hole in the template, such
bit is identified as being too small.
[0003] The exemplary drilling template less efficiently locates the
prescribed drilling sites upon the surface to be drilled. Upon
placement of such drilling template over such surface, the four
drilling sites are known to be at the centers of the four holes of
the template. However, the exact locations of the centers are not
immediately identified. A skilled machinist may be able to closely
approximate the center of each hole utilizing a scratch awl to
indent the drilling sites. However, in many applications, the
tolerance for inaccuracy in drill site location is beyond the
marking capability of a machinist. The instant inventive kit or
assemblage assists drilling template operators in performing such
drilling site locating function by providing a quill and stylus
scribing instrument; the instrument having a plurality of
interchangeable scribing point centering guides; such guides
matching common gauges of drill bits.
BRIEF SUMMARY OF THE INVENTION
[0004] A primary structural component of the inventive assemblage
or kit comprises a hollow bored stylus retaining quill having an
open upper end, and having an open lower end. Preferably, the upper
end of the annular outer surface of the stylus retaining quill is
spirally threaded for threaded mounting thereover of an apertured
slide stopping cap. Also preferably, the lower end of the annular
inner wall of the stylus retaining quill forms an upwardly oriented
coffered step or slide stopping ridge. Also preferably, a conical
ball receiving aperture extends through the wall of the stylus
retaining quill at its lower end. Also preferably, the annular
outer surface of the stylus retaining quill is knurled for
resisting slippage during manual handling.
[0005] A second primary structural component comprises a stylus
having an upper driving end and a lower scribing end. The stylus is
necessarily slidably mounted within the hollow bore of the stylus
retaining quill. Preferably, the upper driving end of the stylus
forms an annular upwardly oriented slide stopping ridge or coffered
step which is engageable with the undersurface of the apertured
slide stopping cap, such engagement limiting upward sliding motion
of the stylus. Also preferably, at a point below said upwardly
oriented slide stopping ridge, the stylus further forms a
downwardly oriented slide stopping ridge or coffered step.
Preferably, the lower end of the stylus extends through a helical
spring whose upper end biases against said downwardly oriented
slide stopping ridge, and whose lower end biases against or is
mechanically linked to an upwardly oriented slide stopping ridge or
coffered stop which is milled into the inner wall of the stylus
retaining quill. For secure engagement of the lower end of the
helical spring with said upwardly oriented slide stopping ridge, an
upwardly opening spring receiving cup having an apertured floor is
preferably disposed between the lower end of the helical spring and
said upwardly oriented slide stopping ridge. Preferably, the
annular outer surface of said cup has an annular flange which is
engageable with said upwardly oriented slide stopping ridge for
limiting downward sliding motion of the stylus. According to the
aforedescribed configuration, the stylus extends axially through
the helical spring and through the aperture within the floor of
said cup.
[0006] Said helical spring normally upwardly positions the stylus
within the hollow bore of the stylus retaining quill so that the
upper driving end of the stylus protrudes upwardly through the
apertured slide stopping cap, and so that the upwardly oriented
slide stopping ridge of the stylus engages the undersurface of said
cap. Preferably, the stylus is jointed at a point above its
downwardly oriented slide stopping ridge; the joint allowing, upon
wear or degradation of the lower scribing end of the stylus,
replacement of the lower end of the stylus.
[0007] Preferably, the lower scribing end of the stylus forms a
conical point for indenting drilling sites upon surfaces.
Alternately and suitably, the lower scribing end of the stylus may
incorporate a printing means, such as an ink or graphite marker,
such means depositing drilling site locating indicia rather than
indenting a surface.
[0008] The present inventive assemblage necessarily further
comprises a plurality of differently sized scribing end centering
guides for centering the lower end of the stylus within a template
aperture. Preferably, each scribing end centering guide has an
upper end adapted for interchangeable attachment to the lower end
of the stylus retaining quill. Also preferably, each scribing end
centering guide has a lower end closely fitted to the inside
diameter of an aperture drilled by a commonly sized drill bit. As
such apertures are typically circular, the lower end of each
scribing end centering guide is preferably circular. Alternately
and suitably, the lower ends of the scribing end centering guides
may be configured as a plurality of radially arranged bearing
surfaces positioned for contact with the annular wall of a circular
template aperture. Ideally, each scribing end centering guide is
configured as a second quill whose hollow bore forms, upon
attachment to the lower end of the stylus retaining quill, a
passage which is continuous with the hollow bore of the overlying
quill. Such alignment of hollow bores allows the stylus to extend
both through the bore of the stylus retaining quill and through the
bore an attached second quill.
[0009] A preferred interchangeable attaching means for alternate
selective attachments of the scribing end centering guides to the
lower end of the stylus retaining quill comprises a quick
disconnect coupling such as a floating ball locking slip joint
wherein a ball bearing alternately engages with and disengages from
an annular ball receiving channel milled within the upper ends of
centering guides. Alternate suitable interchangeable attaching
means include spring biased ball and detent locking slip joints,
spring leaf and detent locking slip joints, ridge and channel
locking slip joints, hook and channel locking slip joints, hook and
ridge locking slip joints, lug and "L" slot locking slip joints,
lug and "L" channel locking slip joints, frictionally attached slip
joints, free sliding slip joints, and spirally threaded joints.
[0010] In use of the inventive assemblage (further referring to the
exemplary four inch square drilling template described above) such
template is precisely positioned and held at a desired location
upon a surface to be drilled. Upon such positioning, the assemblage
is operated by selecting a centering guide having an outside
diameter of 3/8". Said guide is then attached to the lower end of
the stylus retaining quill. The lower end of said guide is then
inserted into one of the 3/8" apertures of the template until the
lower surface of the guide rests upon the surface to be drilled. A
percussive striking force is then applied to the upper driving end
of the stylus, driving the lower scribing end of the stylus into
the surface to be drilled, accurately forming an indentation,
accurately marking one of the 3/8" drilling sites. Alternately,
where the lower scribing end of the stylus is configured for
application of printed indicia rather than a surface indentation,
pressurized contact, as opposed to percussive contact, may be
applied to the upper driving end of stylus. The tool is then
withdrawn and inserted into the diagonally opposed 3/8" aperture of
the template. There, a similar percussive striking force is
applied. The tool is then withdrawn from the template, the 3/8"
guide is removed, and is replaced by a 1/2" centering guide. Center
marking of both 1/2" apertures of the template then proceeds in a
manner identical to the markings of the 3/8" apertures.
[0011] Preferably, the inventive assemblage is configured as a kit
containing a quill and stylus assembly, and containing groupings of
second quills matching common drill bits. Kits matching numbered,
alphabetically lettered, English, or metric drill bit sizes may be
provided.
[0012] Accordingly, it is an object of the present inventive
assemblage to provide a surface scribing stylus slidably mounted
within a quill, and to further provide a plurality of differently
sized interchangeable scribing end centering guides. It is a
further object of the present invention to provide such an
assemblage capable of efficiently and economically performing
center marking within drilling templates.
[0013] Other and further objects, benefits, and advantages of the
present invention will become known to those skilled in the art
upon review of the Detailed Description which follows, and upon
review of the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a side view of the quill and stylus assembly of
the instant invention, such assembly having an exemplary
interchangeably attached stylus end centering guide configured as a
second quill.
[0015] FIG. 2 includes side views of an exemplary set or assemblage
of scribing end centering guides.
[0016] FIG. 3 is a sectional view as indicated in FIG. 1.
[0017] FIG. 4 redepicts FIG. 3, shown in use with a template upon a
surface to be scribed and drilled.
[0018] FIG. 5 is a magnified detail of the view of FIG. 3.
[0019] FIG. 6 redepicts FIG. 5, the view showing the scribing end
centering guide positioned for interchangeable attachment.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0020] Referring now to the drawings, and in particular to FIG. 1,
a hollow bored stylus retaining quill 2 has knurling 3 upon its
annular outer surface, the knurling facilitating slip free manual
handling. An apertured cap 4 is fixedly and removedly attached to
the upper end of the stylus retaining quill 2, preferably by means
of, referring to FIG. 3, spiral threading 6. Referring again to
FIG. 1, the apertured cap 4 has a knurled surface 8 for non-slip
turning and counter-turning for cap removal and cap attachment.
[0021] Referring simultaneously to FIGS. 1 and 2, an exemplary
{fraction (11/16)}" scribing end centering guide is designated by
reference arrow 10. Referring to FIG. 1, said guide 10 is
interchangeably attachable to the lower end of stylus retaining
quill 2. The lower end of said scribing end centering guide 10 is
preferably circularly configured for insertion into common
{fraction (11/16)}" diameter apertures of drilling templates. For
ease of insertion and extraction of the lower end of such scribing
end centering guide 10 into such {fraction (11/16)}" (or
0.6875")circular aperture, the true outside diameter of such guide
is preferably milled to 0.687", allowing for free sliding insertion
into such aperture.
[0022] Referring simultaneously to FIGS. 2 and 3, the scribing end
centering guide 10 is preferably configured as a quill having a
hollow bore 12. Suitably, the lower end of scribing end centering
guide 10 may be configured other than circularly so long as such
end presents bearing surfaces sufficient for centering within a
circular aperture of a drilling template.
[0023] Referring again to FIGS. 1 and 2, the scribing end centering
guide 10 preferably has a slide stopping ridge 14, such ridge
having an annular knurled surface 16 for slip free manual
handling.
[0024] Referring simultaneously to FIGS. 1, 2, and 3, the upper end
of the scribing end centering guide 10 preferably forms the male
end 18 of a quick disconnect coupling, such end 18 having an
annular ball receiving channel 20. Referring to FIG. 6,
installation of the scribing end centering guide 10 upon the lower
end of the stylus retaining quill 2 may be accomplished by first
slidably upwardly moving slide sleeve 22. Upon such upward sliding
motion, ball bearing 24 is freed for lateral rolling motion within
a conical channel 26 extending through the side wall of stylus
retaining quill 2. By rolling outwardly within said channel 26,
ball 24 simultaneously rests within said channel and within an
inwardly opening annular channel 28 of slide sleeve 22. Upon such
lateral motion of ball 24, the lower end of the hollow bore 30 of
stylus retaining quill 2 is cleared for receipt of end 18 of the
quick disconnect coupling. Referring simultaneously to FIGS. 5 and
6, scribing end centering guide 10 is slidably mounted over the
lower end of stylus 32A, causing said stylus to extend downwardly
through hollow bore 12. Upward sliding motion of scribing end
centering guide 10 continues until the upper slide stopping surface
of ridge 14 meets the lower end of the stylus retaining quill 2, as
depicted in FIG. 5.
[0025] Referring to FIG. 6, upon full extension of end 18 into the
lower end of hollow bore 30, slide sleeve 22 is released. Helical
spring 34 biases between opposing annular ridges 36 and 38; and
upon release of the slide sleeve 22, spring 34 drives slide sleeve
22 downwardly. As slide sleeve 22 moves downwardly, a chamfered or
beveled annular ridge 40 drives ball bearing 24 laterally inward
through a conical channel 26 to a position wherein ball bearing 24
simultaneously rests within hollow channel 30 and conical channel
26 as depicted in FIG. 5. Slide stopping ridge 42 engages removable
pressure ring 44, stopping downward sliding motion of slide sleeve
22. Upon such inward ball positioning, ball bearing 24 engages
channel 20, latching the scribing end centering guide 10 in place.
Removal of scribing end centering guide 10 is accomplished through
a reverse of the steps described above.
[0026] While a quick disconnect coupling of the type depicted in
FIGS. 5 and 6 is a preferred interchangeable attaching means, it
can be seen that the respective lower and upper ends of the stylus
retaining quill 2 and the scribing end centering guide 10 may be
configured in conformity with numerous commonly known
interchangeable attaching means. All such interchangeable attaching
means are considered to fall within the scope of the invention.
[0027] Referring to FIG. 3, the stylus is referred to by reference
numerals 32A and 32B, signifying that the stylus may be suitably
configured either as a jointed or a non-jointed article. Through
prolonged use of the stylus, its pointed scribing end 46 may become
dulled. By providing a joint 48 between the upper and lower ends
32B and 32A of the stylus, the lower end 32A of the stylus may be
economically disposed of and replaced without necessitating a
disposal of the upper end 32B.
[0028] Further referring to FIG. 3, the upper end of stylus 32B
preferably forms a coffered inset or step, providing an upwardly
oriented slide stopping ridge 50, such ridge engaging the
undersurface of apertured cap 4, such engagement limiting upward
sliding motion of the stylus. Preferably, the upper end of stylus
32B is flat, forming a percussive or pressurized contact surface
52. Necessarily, the vertical dimension of the upper coffered
section of the upper end of stylus 32B is tailored so that the
percussive contact surface 52 extends above the upper surface of
the apertured cap 4 a distance greater than the distance between
the point of the scribing end 46 and the lower end of the scribing
end centering guide 10. Such tailoring of vertical dimensions
assures that striking or pressurized contact applied to surface 52
will drive scribing end 46 downwardly below the lower end of
scribing end centering guide 10.
[0029] Referring to FIG. 5, stylus 32B and 32A is preferably biased
in a normally upwardly retracted position by helical spring 54, the
upper end of helical spring 54 pressing against an enlarged head 56
formed integrally with the upper end of the lower stylus section
32A, and the lower end of helical spring 54 pressing against the
floor of an apertured cup 58. Preferably, the inner wall of the
hollow bore 30 of quill 2 and the outer wall of the apertured cup
58 are interlockingly coffered, forming annular slide stopping
ridges 60, such ridges 60 preventing the apertured cup 58 from
being driven downwardly through the hollow bore 30 by helical
spring 54.
[0030] In use or operation of the inventive assemblage, a drilling
template 62 having an {fraction (11/16)}" aperture 64 and a 1/2"
aperture 66 is placed over a surface to be drilled, such as a metal
sheet 66. The lower end of scribing end centering guide 10 is then
inserted into aperture 64. A percussive striking force, such as
that supplied by a hammer blow, is then applied to surface 52,
driving the point of scribing end 46 downwardly into sheet metal
66, creating an indented drill bit guiding mark at the precise
center of aperture 64. Thereafter, the tool is withdrawn from
aperture 64 and, centering guide 10 is removed from quill 2 through
upward retraction of slide sleeve 22. Thereafter, referring
simultaneously to FIGS. 2 and 4, 1/2" centering guide 68 is
attached to the lower end of quill 2, and the lower end of guide 68
is inserted into 1/2" aperture 66. A percussive striking force is
then against applied to surface 52, producing a second indentation
at the center of aperture 66. Through repetition of the procedure
described above, the exact centers of numerous apertures of varying
sizes within a template may be quickly and conveniently marked.
[0031] FIG. 2 is representative of a wide variety of assemblages of
scribing end centering guides which may be included as a part of
the instant inventive kit or assemblage. The centering guides
depicted in FIG. 2 are intended for use in conjunction with English
unit drill bits and drilling templates whose diameters are upon
fractions of an inch. Where the instant inventive assemblage is to
be utilized in conjunction with English unit drill bits and
templates, it is preferred that the outside diameters of the
centering guides be selected from sizes {fraction (3/16)}", 1/4",
{fraction (5/16)}", 3/8", {fraction (7/16)}", 1/2", {fraction
(9/16)}", 7/8", {fraction (15/16)}", and 1 inch. Where the
assemblage is for use in conjunction with numerically sized drill
bits, it is preferred that the outside diameters of the centering
guides be selected from numbered sizes 1-25. Where the assemblage
is for use in conjunction with alphabetically sized drill bits, it
is preferred that the outside diameters of the centering guides be
selected from lettered sizes A through Z. Where the assemblage is
for use in conjunction with metric sized drill bits, it is
preferred that the outside diameters of the centering guides be
selected from metric sizes 5 mm through 25 mm.
[0032] While the principles of the invention have been made clear
in the above illustrative embodiment, those skilled in the art may
make modifications in the structure, arrangement, portions and
components of the invention without departing from those
principles. Accordingly, it is intended that the description and
drawings be interpreted as illustrative and not in the limiting
sense, and that the invention be given a scope commensurate with
the appended claims.
* * * * *